Speed converters
Speed represents distance traveled per unit time. Choose an exact direction below, or open the universal converter for all compatible units.
Example speed conversions
Start with a calculated reference value, then open the tool to enter your own measurement. Results marked ≈ are rounded for display.
- Kilometers per Hour to MPH100 km/h ≈ 62.137119224 mph
Understanding speed
Speed is distance divided by time
Miles per hour, kilometers per hour, knots and meters per second express the same physical speed using different distance and time units. A nautical mile is 1,852 meters.
How to verify a conversion
Converting speed does not change the velocity or account for wind, direction, speedometer error or the conditions of a measurement.
Source definitions: NIST Guide to the SI. See our conversion methodology for calculation and rounding details.
Accurate calculations, no guesswork
Every converter uses consistent unit definitions and returns an interactive result you can verify. For multiple measurements, use the batch converter.
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